Why convert JT to IGS?
IGES is a neutral CAD format that older CAM systems, CNC toolpath software, and legacy design tools still require. If a supplier or machinist cannot accept STEP or native formats, .igs is often the fallback they request, and JT is the visualization format commonly exchanged in automotive and aerospace supply chains.
How to convert JT to IGS
CAD Assistant FREE
Open the .jt file in CAD Assistant; go to File > Export and select IGES (.igs / .iges). Choose a save location and click Export.
Siemens NX APP
File > Open the JT in NX; go to File > Export > IGES and adjust solid/surface representation options before clicking OK.
FreeCAD OPEN-SOURCE
File > Open the .jt in FreeCAD; File > Export > IGES (*.igs). Use this as a fallback if CAD Assistant fails on the specific file.
Programs that convert JT
About these formats
.JT
JT (Jupiter Tessellation) 3D CAD visualization file
A JT (Jupiter Tessellation) file is a compact 3D CAD model used in automotive and aerospace engineering to share and review designs without heavy native CAD software. The free way to open…
Open .JT details →
.IGS
IGES - Initial Graphics Exchange Specification (CAD model)
An IGS file is a 3D (or 2D) CAD model stored in IGES format, a vendor-neutral ASCII standard used to move part geometry between different CAD programs. To view it free, open it in FreeCAD,…
Open .IGS details →Quality & what to watch
- IGES works well with B-rep geometry; if the JT is mesh-only, the IGES output will be faceted and most CAM tools will reject it.
- STEP (ISO 10303) is generally a better choice than IGES for modern exchange - both CAD Assistant and FreeCAD can export STEP from JT.
- PMI (manufacturing annotations) and assembly structure are not preserved in IGES; use STEP AP242 if those are needed.
